The influence of phosphorous pentoxide on the phase composition and formation of Portland clinker

Journal Article · Wed Jul 15 04:00:00 EDT 2009 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2008.11.013· OSTI ID:22075436

Stanek, T ^[1]; Sulovsky, P ^[2]

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1. Research Institute of Building Materials, Hnevkovskeho 65, 617 00 Brno (Czech Republic)
2. Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlarska 2, 611 37 Brno (Czech Republic)

The influence of phosphorous pentoxide (P{sub 2}O{sub 5}) on the phase composition and formation of Portland clinker was studied in laboratory conditions. Phosphorous pentoxide in the form of calcium phosphate was added to common cement-making raw meal in graded quantities up to 5 wt.%. The raw meal properties were studied by thermal analysis. The development of clinker formation by burning for periods ranging from 20 s to 30 min in a special semi-automatic oven with a manipulator was followed using light optical microscopy. The phase composition of clinkers burnt to equilibrium was quantified by the optical point counting method. The entry of P{sub 2}O{sub 5} into clinker minerals was determined by electron microprobe analyses. The laboratory tests show that at 0.7 wt.% of P{sub 2}O{sub 5} in the clinker the alite (Ca{sub 3}SiO{sub 5}) content decreases and belite (Ca{sub 2}SiO{sub 4}) content increases. At a P{sub 2}O{sub 5} content of 4.5 wt.% alite formation was totally blocked and the resulting clinker contained free lime in equilibrium with belite.

• OSTI ID: 22075436
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 7 Vol. 60; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CALCIUM PHOSPHATES
CALCIUM SILICATES
CEMENTS
ELECTRON MICROPROBE ANALYSIS
EQUILIBRIUM
MINERALS
OPTICAL MICROSCOPY
PHOSPHORUS OXIDES
THERMAL ANALYSIS